function e = symeq(lhs, rhs)
    % 创建符号等式
    % e = symeq(lhs, rhs);
    % Input [1] >> x = sym('x'); 
    % Input [2] >> symeq(x, 1)
    % Eq(x, 1)
    sp = sympy_sp();
    e = sp.Eq(lhs, rhs);
end